Patchwork [-next,2/2] ARM: scu: provide inline dummy functions when SCU is not present

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Submitter Nishanth Menon
Date June 26, 2013, 2:39 p.m.
Message ID <>
Download mbox | patch
Permalink /patch/254790/
State New
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Nishanth Menon - June 26, 2013, 2:39 p.m.
On platforms such as Cortex-A15 based OMAP5, SCU is not used, however
since much code is shared between Cortex-A9 based OMAP4 (which uses
SCU) and OMAP5, It does help to have inline functions returning error
values when SCU is not present on the platform.

arch/arm/mach-omap2/omap-smp.c which is common between OMAP4 and 5
handles the SCU usage only for OMAP4.

This fixes the following build failure with OMAP5 only build:
arch/arm/mach-omap2/built-in.o: In function `omap4_smp_init_cpus':
arch/arm/mach-omap2/omap-smp.c:185: undefined reference to `scu_get_core_count'
arch/arm/mach-omap2/built-in.o: In function `omap4_smp_prepare_cpus':
arch/arm/mach-omap2/omap-smp.c:211: undefined reference to `scu_enable'

Reported-by: Pekon Gupta <>
Reported-by: Vincent Stehlé <>
Acked-by: Santosh Shilimkar <>
Signed-off-by: Nishanth Menon <>
 arch/arm/include/asm/smp_scu.h |   13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)


diff --git a/arch/arm/include/asm/smp_scu.h b/arch/arm/include/asm/smp_scu.h
index 18d1693..433f9d9 100644
--- a/arch/arm/include/asm/smp_scu.h
+++ b/arch/arm/include/asm/smp_scu.h
@@ -23,10 +23,21 @@  static inline unsigned long scu_a9_get_base(void)
 	return pa;
 unsigned int scu_get_core_count(void __iomem *);
 int scu_power_mode(void __iomem *, unsigned int);
+static inline unsigned int scu_get_core_count(void __iomem *scu_base)
+	return 0;
+static inline int scu_power_mode(void __iomem *scu_base, unsigned int mode)
+	return -EINVAL;
-#ifdef CONFIG_SMP
+#if defined(CONFIG_SMP) && defined(CONFIG_HAVE_ARM_SCU)
 void scu_enable(void __iomem *scu_base);
 static inline void scu_enable(void __iomem *scu_base) {}